Interindividual variation in total and carrier-mediated lactate influx into red blood cells

1998 ◽  
Vol 274 (4) ◽  
pp. R1025-R1030 ◽  
Author(s):  
Leena K. Väihkönen ◽  
A. Reeta Pösö
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Venous Blood ◽  
Age Groups ◽  
Lactate Concentration ◽  
Bimodal Distribution ◽  
Monocarboxylate Transporter ◽  
Interindividual Variation ◽  
Transport Activity ◽  
Major Carrier

To study in standardbred horses interindividual variation in the influx of lactate into red blood cells, venous blood samples were collected from 89 horses from 2 wk to 9 yr of age. For 62 horses, the rate of influx was normally distributed with a mean rate of 4.09 nmol ⋅ mg protein−1 ⋅ min−1at a lactate concentration of 10 mM, and the respective value for the other 27 horses was 0.58 nmol ⋅ mg protein−1 ⋅ min−1. At 30 mM of lactate, the rates were 8.71 and 1.97 nmol ⋅ mg protein−1 ⋅ min−1, respectively. This bimodal distribution was independent of age. In horses with high transport activity, the monocarboxylate transporter (MCT) appears to be the major carrier, whereas, in those with low transport activity, no activity of the MCT could be detected. The band 3 protein may account for 18–39% of transport activity. With all age groups combined, the transport activity tended to be higher in mares than in stallions. Lactate transport into red blood cells seems thus to be an inherent property in which participation of various transporters varies interindividually.

scholarly journals Using Redox Potential as a Feasible Marker for Banked Blood Quality and the State of Oxidative Stress in Stored Red Blood Cells

2020 ◽  
Author(s):  
Rodney C Daniels ◽  
Hyesun Jun ◽  
Robertson D Davenport ◽  
Maryanne M Collinson ◽  
Kevin R Ward
Keyword(s):  
Oxidative Stress ◽  
Redox Potential ◽  
Red Blood Cells ◽  
Healthy Volunteers ◽  
Blood Cells ◽  
Storage Time ◽  
Cell Function ◽  
Venous Blood ◽  
Functional Changes ◽  
Over Time

Abstract Background Stored Red Blood Cells (RBCs) may undergo oxidative stress over time, with functional changes affecting critical tasks such as oxygen delivery. Central to these changes are oxidation-reduction (redox) reactions and the redox potential (RP) that must be maintained for proper cell function. RP imbalance can lead to oxidative stress that may contribute to storage lesions and transfusion-related morbidities. Direct measures of RP may allow for evaluation of erythrocyte quality and enable corrections of RP prior to transfusion. Methods Multiple random RBC segments were tested, ranging in age from 5 to 40 days at 5 day intervals. RP was recorded by measuring open circuit potential of RBCs using novel nanoporous gold electrodes with Ag/AgCl reference. RP measures were also performed on peripheral venous blood samples from 10 healthy volunteers. RP measures were compared between groups of aged RBCs, and with volunteer blood. Results Stored RBCs show time-dependent increases in RP. There were significant differences in Day 5 RP compared to all other groups (p≤0.005), Day 10-15 vs ages ≥ Day 20 (p≤0.025), Day 20-25 vs Day 40 (p=0.039), and all groups compared to healthy volunteers. RP became more positive over time suggesting ongoing oxidation as RBCs age. However, storage time alone does not predict the ultimate RP value measured from a given unit.Conclusions There are significant differences in RP between freshly stored RBCs and all others, with RP becoming more positive over time. However, storage time alone does not predict RP, indicating RP screening may be important independent of storage time and may serve as a marker of RBC quality and state of oxidative stress. RP measurements may also provide a target by which to restore RP balance in aged pRBCs, improving their clinical effectiveness while reducing associated morbidities.

Cell volume and metabolic dependence of NEM-activated K+-Cl- flux in human red blood cells

1985 ◽  
Vol 249 (1) ◽  
pp. C124-C128 ◽  
Author(s):  
P. K. Lauf ◽  
C. M. Perkins ◽  
N. C. Adragna
Keyword(s):  
Red Blood Cells ◽  
Cell Volume ◽  
Blood Cells ◽  
Time Course ◽  
Transport Activity ◽  
Human Red Blood Cells ◽  
Atp Breakdown ◽  
The Difference ◽  
Metabolic Dependence ◽  
K Transport

The effects of incubation in anisosmotic media and of metabolic depletion on ouabain-resistant (OR) Cl--dependent K+ influxes stimulated by N-ethylmaleimide (NEM) were studied in human red blood cells using Rb+ as K+ analogue. The NEM-stimulated but not the basal Rb+-Cl- influx measured in phosphate-buffered anisosmotic media was found to be cell volume dependent. When cellular ATP, [ATP]c, was lowered to less than 0.10 of its initial level by exposure to nonmetabolizable 2-deoxy-D-glucose, the NEM-stimulated but not the basal Cl--dependent Rb+ influxes were abolished. Metabolically depleted red blood cells subsequently repleted by incubation in glucose plus inosine regained the NEM-inducible Rb+ (K+) transport activity. The difference in the time course of ATP breakdown and Rb+ influx inhibition suggests that energization of the NEM-stimulated Rb+ flux by metabolism may involve factors additional to ATP.

scholarly journals ELECTRON MICROSCOPE ANALYSIS OF YOUNG AND OLD RED BLOOD CELLS STAINED WITH COLLOIDAL IRON FOR SURFACE CHARGE EVALUATION

1969 ◽  
Vol 43 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Y. Marikovsky ◽  
D. Danon
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Membrane Surface ◽  
Phthalate Esters ◽  
Age Groups ◽  
Red Cells ◽  
Electric Mobility ◽  
Iron Particles ◽  
Colloidal Iron ◽  
Thin Sections

Human and rabbit red blood cells, separated into "young" and "old" age groups by differential flotation on phthalate esters, were fixed with glutaraldehyde and labeled with colloidal ferric oxide. Electron micrographs of thin sections of young cells showed a uniform and dense depostion of positive iron particles. Old cells showed particles deposited irregularly, leaving unlabeled gaps on the membrane surface. Red cells incubated with 10 units/ml receptor-destroying enzyme (RDE) demonstrate a reduced labeling, similar to that of old cells. After neuraminic acid had been removed from red cells by 20 units/ml RDE, no iron particles were found on membrane surfaces. The different labeling of young, old, and RDE-treated human and rabbit red cells was correlated with their electric mobility and agglutinability by poly-L-lysine. The contradiction between the apparent similarity in charge density of human and rabbit red cells as estimated by density of iron particles and the markedly lower electric mobility of rabbit red cells is discussed.

scholarly journals Localisation of Lactate Transporters in Rat and Rabbit Placentae

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Nigel P. Moore ◽  
Catherine A. Picut ◽  
Jeffrey H. Charlap
Keyword(s):  
Red Blood Cells ◽  
Blood Vessels ◽  
Blood Cells ◽  
Opposite Polarity ◽  
Monocarboxylate Transporter ◽  
Sprague Dawley ◽  
Nucleated Red Blood Cells ◽  
Sprague Dawley Rats ◽  
New Zealand White Rabbits ◽  
Pyruvic Acids

The distribution of monocarboxylate transporter (MCT) isoforms 1 and 4, which mediate the plasmalemmal transport of l-lactic and pyruvic acids, has been identified in the placentae of rats and rabbits at different ages of gestation. Groups of three pregnant Sprague-Dawley rats and New Zealand White rabbits were sacrificed on gestation days (GD) 11, 14, 18, or 20 and on GD 13, 18, or 28, respectively. Placentae were removed and processed for immunohistochemical detection of MCT1 and MCT4. In the rat, staining for MCT1 was associated with lakes and blood vessels containing enucleated red blood cells (maternal vessels) while staining for MCT4 was associated with vessels containing nucleated red blood cells (embryofoetal vessels). In the rabbit, staining for MCT1 was associated with blood vessels containing nucleated red blood cells while staining for MCT4 was associated with vessels containing enucleated red blood cells. Strength of staining for MCT1 decreased during gestation in both species, but that for MCT4 was stronger than that for MCT1 and was consistent between gestation days. The results imply an opposite polarity of MCT1 and MCT4 across the trophoblast between rat and rabbit.

scholarly journals The effect of cardiopulmonary bypass on the morphological characteristics of red blood cells and the gas transmission function of blood

2019 ◽  
Vol 21 (2) ◽  
pp. 7-12
Author(s):  
G G Khubulava ◽  
D Yu Romanovskiy ◽  
A M Volkov ◽  
A V Biryukov ◽  
I R Skibro ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Red Blood Cells ◽  
Morphometric Analysis ◽  
Extracorporeal Circulation ◽  
Blood Cells ◽  
Venous Blood ◽  
The Body ◽  
Postoperative Treatment ◽  
Tissue Respiration ◽  
Oxygen Capacity

Investigate the effect of extracorporeal circulation on the erythrocyte morphology, the intensity of gas exchange in the body tissues of the patient was determined before the operation, during the operation and during the postoperative treatment using morphometric analysis of the form of erythrocytes. It was established that during the operation with artificial blood circulation, the ratio of the voltage of oxygen and carbon dioxide in arterial and venous blood changes, indicating a shift in the oxygen capacity of the blood. Since the oxygen concentration in the oxygenator is known and under constant control, a decrease in the oxygen capacity of the blood reflects the intensity of tissue respiration on the one hand, and the degree of mechanical damage to red blood cells on the other. The intensity of tissue respiration was judged on the basis of a previously unknown fact that the form of erythrocytes depends on the degree of their saturation with oxygen. It is noted that blood, saturated with oxygen (arterial) under normal conditions of gas exchange in the lungs, is 90-95% composed of small red blood cells (villous length 0,3-0,4 μm), venous blood is represented mainly by large vorous forms of red blood cells (villous length 0,4-1 μm). The form of red blood cells is reversible and changes both after passing through the lungs (oxygenator), and after gas exchange in the tissues. The inhibition of oxygen consumption by red blood during perfusion indicates a change in the metabolic processes, shape and resistance of red blood cells, which allows a more complete assessment of the pathophysiological changes that occur in the body in response to perfusion. The proposed methods of morphometric analysis of erythrocytes, as well as determining their osmotic resistance, can serve as express methods for analyzing red blood during heart operations using extracorporeal circulation, in order to correct it in time and replenish it.

scholarly journals Heterogeneous timing of asexual cycles in Plasmodium falciparum quantified by extended time-lapse microscopy

2018 ◽  
Author(s):  
Heungwon Park ◽  
Shuqiang Huang ◽  
Katelyn A. Walzer ◽  
Lingchong You ◽  
Jen-Tsan Ashley Chi ◽  
...  
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Single Cells ◽  
Time Lapse ◽  
Bimodal Distribution ◽  
Host Cells ◽  
Cycle Period ◽  
Human Red Blood Cells ◽  
Asexual Cycle

ABSTRACTMalarial fever arises from the synchronous bursting of human red blood cells by the Plasmodium parasite. The released parasites re-infect neighboring red blood cells and undergo another asexual cycle of differentiation and proliferation for 48 hours, before again bursting synchronously. The synchrony of bursting is lost during in vitro culturing of the parasite outside the human body, presumably because the asexual cycle is no longer entrained by host-specific circadian cues. Therefore, most in vitro malaria studies have relied on the artificial synchronization of the parasite population. However, much remains unknown about the degree of timing heterogeneity of asexual cycles and how artificial synchronization may affect this timing. Here, we combined time-lapse fluorescence microscopy and long-term culturing to follow single cells and directly measure the heterogeneous timing of in vitro asexual cycles. We first demonstrate that unsynchronized laboratory cultures are not fully asynchronous and the parasites exhibit a bimodal distribution in their first burst times. We then show that synchronized and unsynchronized cultures had similar asexual cycle periods, which indicates that artificial synchronization does not fundamentally perturb asexual cycle dynamics. Last, we demonstrate that sibling parasites descended from the same schizont exhibited significant variation in asexual cycle period, although smaller than the variation between non-siblings. The additional variance between non-siblings likely arises from the variable environments and/or developmental programs experienced in different host cells.

Increased red blood cell aggregation in patients with idiopathic intracranial hypertension

2006 ◽  
Vol 96 (10) ◽  
pp. 483-487 ◽  
Author(s):  
Anat Kesler ◽  
Yossi Yatziv ◽  
Itzhak Shapira ◽  
Einor Ben Assayag ◽  
Shlomo Berliner
Keyword(s):  
Red Blood Cells ◽  
Intracranial Hypertension ◽  
Blood Cells ◽  
Venous Blood ◽  
Cell Aggregation ◽  
Vascular Risk ◽  
Cross Sectional ◽  
Peripheral Venous Blood ◽  
Red Blood Cell Aggregation ◽  
Slide Test

SummaryIt was the objective of this study to explore the possibility that the aggregation of red blood cells is enhanced in individuals with increased intracranial hypertension (IIH). This is a prospective cross sectional examination in a cohort of patients with IIH and matched controls.The aggregation of red blood cells in the peripheral venous blood was determined by using a slide test and image analysis.We have presently included a group of 33 women with IIH and the same number of women matched for age, body mass index, vascular risk factors and medications. A significant (p=0.038) increment in fibrinogen concentrations was noted in the patients (341 ± 60.8 mg/dl) as opposed to the controls 307.9 ± 64.8).The same stands for the aggregation of red blood cells (aggregation parameter of 8.7 ± 4.9 in patients vs.5.9 ± 3.2 in the controls, p=0.001).We noted an increment in the aggregation of red blood cells in the peripheral blood of 33 women with IIH as opposed to matched controls. Being associated with capillary slow flow,these findings might be relevant to the ethiopathogenesis of this disease.

scholarly journals Study of blood levels of Lactate, Vitamin D and Nucleated Red Blood Cells for early prediction of Hypoxic–Ischemic Encephalopathy: A case-control study

2021 ◽  
Author(s):  
Ahmed Hosni Saad ◽  
Ahmed Thabet Mahmoud ◽  
Mohamed Abdelrehem Soliman ◽  
Alyaa Ahdy Abdelaziz
Keyword(s):  
Vitamin D ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Venous Blood ◽  
White Blood Cells ◽  
Control Group ◽  
Blood Levels ◽  
P Value ◽  
Nucleated Red Blood Cells ◽  
Control Study

Abstract Objective and background: Perinatal asphyxia is a serious medical condition in which there is lack of oxygen or blood flow during, or even after the labor process. So, this study aimed to study serum blood levels of Lactate, vitamin D and count of nucleated Red Blood Cells (nRBCs) per 100 White Blood Cells (WBCs) as early biological predictors of Hypoxic–Ischemic Encephalopathy (HIE) after birth Asphyxia.Methods: A retrospective case-control study was conducted on 20 neonates with HIE comprising the cases (APGAR ≤ 5) and another 20 neonates representing the control group with their age, sex, and weight matched, admitted to NICU from March 2020 to the end of September 2020 at Menoufia University Hospital and El-Bagour Central Hospital, Egypt. Venous blood samples for lactate, vitamin D and nucleated RBCs were drawn during 1st 6h of birth and sent for analysis. Sarnat score was used to assess the severity of HIE.Results: Venous blood levels of lactate and nucleated Red Blood Cells per 100 White Blood Cells (nRBC/100 WBC) counts were significantly higher in HIE neonates than in the control group with a highly significant difference (P-value < 0.001). While serum Vitamin D was significantly lower in the HIE group than in the control (P-value < 0.001).Conclusion: Serum lactate level, vitamin D level and nRBCs/100 WBCs might be used as biomarkers in the early prediction of HIE.

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